Welcome to YUI

YUI is a library of JavaScript utilities and controls for building richly interactive web applications using techniques such as DOM Scripting, DHTML, and Ajax. It is available under a BSD license and is free for all uses.

Our Projects

YUI Library has two codelines and several tools:

• YUI 2 is mature and production-quality.
• YUI 3 is the next generation implementation of the YUI library containing production-quality core components and utilities.
• YUI Compressor to minify and obfuscate your JS and CSS.
• YUI Doc to generate beautiful, organized, searchable API docs for your JS code.

Contribute to YUI

YUI projects are open-source community projects — join us! Pull the source from Git, submit bug reports, make feature requests, and join the forums.

Anyone can contribute code to YUI by signing and returning a Contributor's License Agreement. See the YUI Contributor's Page for more information.

The YUI Community

Follow the YUI Project on Twitter; you can read more about YUI and frontend engineering on Yahoo's YUIBlog.

About YUILibrary.com

This site will become the principal online home for the YUI Library over the coming months. Today, the majority of documentation for YUI can be found on the Yahoo! Developer Network. If you're looking to get started with YUI, please begin with the YUI web site on YDN.